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Goodwill and Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The change in the carrying value of goodwill for the year ended December 31, 2023 and 2022, categorized by reportable segment, is as follows (in thousands):
Clear AlignerSystems and ServicesTotal
Balance as of December 31, 2021
$112,208 $306,339 $418,547 
Additions from acquisition— 8,729 8,729 
Foreign currency translation adjustments(2,728)(16,997)(19,725)
Balance as of December 31, 2022
109,480 298,071 407,551 
Foreign currency translation adjustments1,606 10,373 11,979 
Balance as of December 31, 2023
$111,086 $308,444 $419,530 
Schedule of Amortized Intangible Assets
Acquired finite lived intangible assets were as follows, excluding intangible assets that were fully amortized (in thousands):
Weighted Average Amortization Period (in years)
Gross Carrying Amount as of
December 31, 2023
Accumulated
Amortization		Accumulated Impairment Loss
Net Carrying
Value as of
December 31, 2023
Existing technology10$112,051 $(45,331)$(4,328)$62,392 
Customer relationships1021,500 (8,063)— 13,437 
Trademarks and tradenames1016,600 (7,605)(4,122)4,873 
Patents 86,511 (6,082)— 429 
$156,662 $(67,081)$(8,450)81,131 
Foreign currency translation adjustments987 
Total intangible assets, net 1
$82,118 
1    Also includes $34.3 million of fully amortized intangible assets related to customer relationships.

Weighted Average Amortization Period (in years)
Gross Carrying
Amount as of
December 31, 2022
Accumulated
Amortization 		Accumulated Impairment Loss
Net Carrying
Value as of
December 31, 2022
Existing technology10$112,051 $(33,537)$(4,328)$74,186 
Customer relationships1021,500 (5,913)— 15,587 
Trademarks and tradenames1017,200 (6,442)(4,122)6,636 
Patents86,511 (5,288)— 1,223 
$157,262 $(51,180)$(8,450)97,632 
Foreign currency translation adjustments(1,912)
Total intangible assets, net 1
$95,720 
1    Also includes $33.5 million of fully amortized intangible assets related to customer relationships.
Schedule of Future Amortization for Finite-Lived Intangible Assets
The total estimated annual future amortization expense for these acquired intangible assets as of December 31, 2023 is as follows (in thousands):
Fiscal YearAmortization
2024$15,335 
202514,959 
202614,353 
202711,992 
202810,890 
Thereafter13,602 
Total$81,131